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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3cdfceefd636cb5de155162e39266046bfecf89d8c6e595c86565cf7309cb2e' 
  AND token = 'SB52pNThBog6WU+5+9yE+KK6ASN1PfIq0hO9vL6Drkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}